Ήλιο (Greek Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ήλιο" in Greek language version.

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photonics.com

  • Helium: Up, Up and Away? Melinda Rose, Photonics Spectra, Oct. 2008. Accessed Feb 27, 2010. For a more authoritative but older 1996 pie chart showing U.S. helium use by sector, showing much the same result, see the chart reproduced in "Applications" section of this article.

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usgs.gov

minerals.usgs.gov

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wisc.edu

digicoll.library.wisc.edu

  • Mullins, P.V.· Goodling, R. M. (1951). Helium. Bureau of Mines / Minerals yearbook 1949. σελίδες 599–602. Ανακτήθηκε στις 20 Ιουλίου 2008.